If the work done to stretch an ideal spring by 4.0 cm is 6.0 J, what is the spring constant of this spring?
A) 300 N/m
B) 3000 N/m
C) 3500 N/m
D) 7500 N/m
E) 6000 N/m
D
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The average density of the Sun is most similar to which object?
A) the Earth B) Jupiter C) Mercury D) the Moon E) Halley's Comet's nucleus
What happens when a star like the sun exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. B) It contracts, becoming hotter and brighter. C) It contracts, becoming smaller and dimmer. D) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness. E) It expands, becoming bigger but dimmer.
You have 10 tungsten bulbs, and each uses 100 watts. You leave them all on for an hour. The energy used is
A. 10 kilowatt-hours B. 1 kilowatt-hour C. 10 kilowatts D. 1000 watts
Vector A has a magnitude of 3.0 units and makes an angle of -90.0
with the positive x-axis. Vector B has a magnitude of 4.0 units and makes an angle of -120
with the positive x-axis. What is the direction of the vector sum of A + B referenced to the positive x-axis?
A. -107
B. 55
C. -55
D. -145